, the fbi says a letter sent to presidentbarackobamahastested positive for the deadly poison ricin. >> the letter was intercepted tuesday at a mail screening facility. american media say that the letter sent to obama and another letter sent to roger wicker were both postmarked memphis, tennessee. additional tests are due in the next 48 hours to confirm the presence of the toxin. >> our washington correspondent is following this for us. any idea as to who might be behind this? >> oh -- we do not have a suspect yet, but there was a signature on the letters. the letters included the phrase "to see a wrong and not to expose it is to become to -- a silence -- is to become a silent partner to it." president obama said, "i am president obama and i approve this message." this is someone who wants to get attention. it is important to note that both are getting letters right now, republicans and democrats. that says to me this is someone who really hates government. the u.s. -- in the u.s., antigovernment extremists have a fascination with ricin in the past. you can easily buy manuals on how

is preparing for the arrival ofpresidentobamawhowill attend an interfaith service tomorrow and preparing for what many know will be a long, difficult journey to recovery. in boston, vows of resolve today amid emotions that are still raw. a relieved 20-year-old sarah gerard left the hospital with her leg in a cast. >> i have a fractured shin bone and a fractured heel bone from the shrapnel that hit it. >> reporter: for liz norden, there is no relief. her two sons, paul and jp, each lost a leg and were burned. >> i'm waiting to wake up from this nightmare. i'm hoping it's not real. >> reporter: even secretary of state john kerry, massachusetts senator for 28 years, struggled as he testified before congress. >> you know, boston is not going to be intimidated by this. but we are going to find out who did this. >> reporter: boston is a city still on edge. a bomb scare forced the evacuation of the federal courthouse. and it is a city in mourning. boston university student lingzi lu identified as the third victim of the bombing. the 23-year-old graduate student from china was watching the marat

images of two suspects in the boston bombings andpresidentobamaissuesthe rallying message for a proud city. >> this time nextear, on the third monday april, the world will return to this great american city to run harder than ever and to cheer even louder. thelosion with power of an earthquake ripped through a texas town, killing as many as 15 people. and strike up the orchestra, the make history woman by conducting the last night at the pops. viewers on public television in america and around the globe. in boston, the fbi has given a press briefing on the investigation into the bombings at the boston marathon. they released photographs of two suspects and called on the public to help identify the man they described as armed and dangerous. we can go live now to boston. extraordinary amount of detail coming out on the state of this investigation. >> yes, and t pretty clear images of the people the fbi described as suspects, people that wanted to talk to. very clear language there, and also very clear warning from the fbi that they considered these men to be extremely dangerous. not tr

about the bill. >> reporter: furious,presidentobamasaidthe bill did not harm gun rights. >> this legislation met that test. and too many senators failed theirs. >> reporter: more anger erupted when a woman shouted at senators, shame on you. most republicans and four democrats from states with high gun ownership voted against expanding background checks. >> criminals do not submit to background checks now. they will not submit to expanded background checks. >> the way to stop violent crime is to stop violent criminals. >> reporter: the politics was about more than gun rights. later today, a bipartisan group of senators will roll out immigration reform. democrat senator joe manchin who fought hard to get enough votes on background checks found that with two politically hard votes, some senators chose immigration over guns. >> if you're looking at it and trying to evaluate it, they're saying maybe immigration and maybe guns on top of that might be too much for me to go home and explain. >> reporter: and many of those senators who voted no, toe me they had hearty most from t

, and the information that we received from the federal people that senator wicker andpresidentobamareceived.>> more tests are being done on the letters. more details now about the poison ricin. it comes from the bean of the caster oil plant, and it is deadliest when inhaled. it could be used to kill an individual, but would not work for a large group of people, and does not pass from person to person. there is only one known assassination using ricin. in 1978, a bulgarian dissident. >>> sabotage in the south bay. new details on the attacks on two crucial utilities. why investigators think they were coordinated. >> possible relief for allergy sufferers. >> then. >> there are firefighters down. >> our coverage of the deadly massive explosion in texas continues. we're gathering new details on this breaking story. >>> all in all, this was a pretty shameful day for washington, but this effort is not over. >> a visibly angry president obama stands with the families of those killed in the newtown massacre. the president isn't the only one blasting the senate for narrowly rejecting the measure. heather hol

that senator wicker andpresidentobamareceived.>> more tests are being done on the letters. more details now about the poison ricin. it comes from the bean of the caster oil plant, and it is deadliest when inhaled. it could be used to kill an individual, but would not work for a large group of people, and does not pass from person to person. there is only one known assassination using ricin. in 1978, a bulgarian dissident. >>> sabotage in the south bay. new details on the attacks on two crucial utilities. why investigators think they were you kids should count yourselves lucky. we didn't have u-verse back in my day. you couldn't just... guys... there you are. you know you couldn't just pause a show in one room, then... where was i... you couldn't pause a show in one room then start playing it in another. and...i'm talking to myself... [ male announcer ] call to get u-verse tv for just $19 a month for 2 years with qualifying bundles. rethink possible. >>> all in all, this was a pretty shameful day for washington, but this effort is not over. >> a visibly angry president obama stands with the

topresidentobama, vicepresident biden for their leadership and standing strong and continuing to fight for a safer america. i would like to say they're see forhank you to the senators legislation that would keep guns out of hand and save lives. they stood by us right from the beginning. they were with us. we will not be defeated. we are not defeated. we will not be defeated. we are here now. we will always be here. we have no other choice. we are not going away. every day more people are killed in this country because of gun violence. our determination grows stronger. we leave washington hoping that others, both here and across the country, will join us in making the sandy hook promise. i pledge that we have great hope that more senators will take literally. i would like to end i repeating the sandy hook thomas begins, our hearts are broken. our spirits is not. thank you. it is now my great pleasure to introduce the president of the united states of america, barack obama. >> good job. , in few months ago response to too many tragedies, including the shootings of a u.s. congressman, gab

: but south carolina republican lindsey graham said the measures being touted bypresidentobamaandmost democrats would do little to reduce gun violence. >> the president wanted three things done. he wanted to ban assault weapons. he wanted to limit magazine sizes. and he wanted to impose a universal background check. well all three of those concepts are going to be on the floor of the united states senate for a vote, and they're all going to lose. why? because they're not the solution to the problem we all face. >> on this vote the yeas are 54, the nays are 46. >> reporter: in the end, as vice president biden presided, the background check amendment failed to clear the 60-vote threshold needed to pass. the concealed firearm measure and the ban on assault weapons. also failed. but late in the day, senate democrats-- joined by family members of victims of gun violence-- pledged to keep up the fight. >> i want everyone to understand this is just the beginning not the end. the forces so obsessed with defeating any commonsense reforms whatsoever, they lost site of big picture. >> reporter:

to presidentbarackobamatestedpositive for the poisonous ricin. the u.s. secret service said the letter was intercepted as a white house mail screening facility on tuesday. press secretary jay carney says the president has been briefed on the letter and orders the investigation continue in the boston bombings first and say this is no indicated link between the letters and the bombing bombings. >> . >> the bombings in boston that killed and maimed people have his absolute focus. >> u.s. media say a suspicious letter was also found at the congressional office of republican senator richard shelby of alabama. and senator roger wicker was also targeted this week. >>> chinese warships patrolled disputes islands wednesday as part of an exercise. the senkaku islands are controlled by japan but claimed by china and taiwan. china's state-run media say the ships are part of their navy fleets, including a missile destroyer and a missile frigate. the vessels entered the waters on tuesday night and stayed until just before dawn the next day, after conducting drills in the western pacific. they practi

with this individual who they have on video. kelly. >> scott, we'll leave it there for now. we knowpresidentobamaisvisiting the area. >>> in the meantime, commodity prices are selling off. the sell-off i should say continues. it's mostly copper today, though. and we are certainly off the lows. in fact, something of a rebound shaping up now with gold up better than 1%. crude participating, as well. brent and nymex there both remaining below if you want to call them key psychological levels of $109 a barrel respectively. we've seen miners down significantly in some cases this morning. coming off the lows of the session. how do you play the commodities space? what other opportunities might the u.s. offer in particular here? darren joins me from yorkville capital. welcome. you're here to talk infrastructure, but the conference is about infrastructure, but what you're talking about, really, are some of the opportunities that the u.s. now offers, given a lot of the big changes we've recently seen when it comes to shale gas. >> absolutely. i will start out with two questions for you today. what's the

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